Taropatch.net: Slack Key Guitar Online Maybe others know about this already but I just found it. Pretty darn cool, even for looking at scales and modes, and their relationship to chords, in standard tuning. Lets you switch the fretboard image between note names and intervals on the fly. I explained an E-major chord to my novice flute-playing ten year old daughter in about five minutes. "These are the notes of the E-major scale - you need the root, fifth and third notes to build a major chord - here they are as invervals - these are their names, finger it, strum it" The light came on and she grinned. When you start re-tuning strings it gets really cool.